From fffb401638ac08e395785eadb1ab0ae1d17613aa Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 14 Apr 2024 23:19:56 +0200
Subject: feat(engine): create texture IDs automatically

---
 engine/src/renderer/mod.rs | 10 +++++-----
 engine/src/texture.rs      | 41 +++++++++++++++++++++++++++++++----------
 2 files changed, 36 insertions(+), 15 deletions(-)

(limited to 'engine/src')

diff --git a/engine/src/renderer/mod.rs b/engine/src/renderer/mod.rs
index 304c38b..ef653a2 100644
--- a/engine/src/renderer/mod.rs
+++ b/engine/src/renderer/mod.rs
@@ -40,7 +40,7 @@ use crate::opengl::vertex_array::{PrimitiveKind, VertexArray};
 use crate::opengl::{clear_buffers, enable, BufferClearMask, Capability};
 use crate::projection::new_perspective;
 use crate::shader::Program as ShaderProgram;
-use crate::texture::{Id as TextureId, Map as TextureMap, Texture};
+use crate::texture::{Id as TextureId, List as TextureMap, Texture};
 use crate::transform::Transform;
 use crate::vector::{Vec2, Vec3};
 use crate::vertex::Vertex;
@@ -146,14 +146,14 @@ fn render(
                 &shader_program_curr_bound,
             );
 
-            for (texture_id, texture) in &texture_map.inner {
+            for texture in &texture_map.list {
                 let gl_texture = gl_textures
-                    .entry(*texture_id)
+                    .entry(texture.id())
                     .or_insert_with(|| create_gl_texture(texture));
 
-                let texture_unit = TextureUnit::from_texture_id(*texture_id)
+                let texture_unit = TextureUnit::from_texture_id(texture.id())
                     .unwrap_or_else(|| {
-                        panic!("Texture id {texture_id} is a invalid texture unit");
+                        panic!("Texture id {} is a invalid texture unit", texture.id());
                     });
 
                 set_active_texture_unit(texture_unit);
diff --git a/engine/src/texture.rs b/engine/src/texture.rs
index b0f0278..5cea9ff 100644
--- a/engine/src/texture.rs
+++ b/engine/src/texture.rs
@@ -1,6 +1,6 @@
-use std::collections::HashMap;
 use std::fmt::Display;
 use std::path::Path;
+use std::sync::atomic::{AtomicU32, Ordering};
 
 use ecs::Component;
 use image::io::Reader as ImageReader;
@@ -10,6 +10,8 @@ use crate::color::Color;
 use crate::opengl::texture::PixelDataFormat;
 use crate::vector::Vec2;
 
+static NEXT_ID: AtomicU32 = AtomicU32::new(0);
+
 mod reexports
 {
     pub use crate::opengl::texture::{Filtering, Wrapping};
@@ -20,6 +22,7 @@ pub use reexports::*;
 #[derive(Debug, Clone)]
 pub struct Texture
 {
+    id: Id,
     image: DynamicImage,
     pixel_data_format: PixelDataFormat,
     dimensions: Vec2<u32>,
@@ -52,7 +55,10 @@ impl Texture
 
         let dimensions = Vec2 { x: image.width(), y: image.height() };
 
+        let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
+
         Ok(Self {
+            id: Id::new(id),
             image,
             pixel_data_format,
             dimensions,
@@ -69,7 +75,10 @@ impl Texture
             Rgb([color.red, color.green, color.blue]),
         );
 
+        let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
+
         Self {
+            id: Id::new(id),
             image: image.into(),
             pixel_data_format: PixelDataFormat::Rgb,
             dimensions: dimensions.clone(),
@@ -77,6 +86,12 @@ impl Texture
         }
     }
 
+    #[must_use]
+    pub fn id(&self) -> Id
+    {
+        self.id
+    }
+
     #[must_use]
     pub fn properties(&self) -> &Properties
     {
@@ -107,6 +122,14 @@ impl Texture
     }
 }
 
+impl Drop for Texture
+{
+    fn drop(&mut self)
+    {
+        NEXT_ID.fetch_sub(1, Ordering::Relaxed);
+    }
+}
+
 /// Texture error.
 #[derive(Debug, thiserror::Error)]
 pub enum Error
@@ -152,9 +175,7 @@ pub struct Id
 
 impl Id
 {
-    /// Returns a new texture ID.
-    #[must_use]
-    pub fn new(id: u32) -> Self
+    fn new(id: u32) -> Self
     {
         Self { id }
     }
@@ -173,19 +194,19 @@ impl Display for Id
     }
 }
 
-/// Texture map.
+/// Texture list.
 #[derive(Component)]
-pub struct Map
+pub struct List
 {
-    pub inner: HashMap<Id, Texture>,
+    pub list: Vec<Texture>,
 }
 
-impl FromIterator<(Id, Texture)> for Map
+impl FromIterator<Texture> for List
 {
     fn from_iter<Iter>(iter: Iter) -> Self
     where
-        Iter: IntoIterator<Item = (Id, Texture)>,
+        Iter: IntoIterator<Item = Texture>,
     {
-        Self { inner: iter.into_iter().collect() }
+        Self { list: iter.into_iter().collect() }
     }
 }
-- 
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